Examples of org.neo4j.graphdb.Transaction

org.neo4j.graphdb.Transaction
operation that works with the node space tx.success(); } finally { tx.finish(); }
Let's walk through this example line by line. First we retrieve a Transaction object by invoking the {@link GraphDatabaseService#beginTx()} factory method.This creates a new Transaction instance which has internal state to keep track of whether the current transaction is successful. Then we wrap all operations that work with the node space in a try-finally block. At the end of the block, we invoke the {@link #finish() tx.success()} method to indicatethat the transaction is successful. As we exit the block, the finally clause will kick in and {@link #finish() tx.finish} will commit the transaction ifthe internal state indicates success or else mark it for rollback.
If an exception is raised in the try-block, {@link #success()} will never beinvoked and the internal state of the transaction object will cause {@link #finish()} to roll back the transaction. This is very important:unless {@link #success()} is invoked, the transaction will fail upon{@link #finish()}. A transaction can be explicitly marked for rollback by invoking the {@link #failure()} method.
Read operations inside of a transaction will also read uncommitted data from the same transaction.

            if (this.edgeIndexKeys.size() > 0)
                builder.setConfig(GraphDatabaseSettings.relationship_keys_indexable, edgeIndexKeys.toString().replace("[", "").replace("]", "")).setConfig(GraphDatabaseSettings.relationship_auto_indexing, "true");


            rawGraphDB = builder.newGraphDatabase();


            Transaction tx = rawGraphDB.beginTx();
            try {
                GlobalGraphOperations graphOperations = GlobalGraphOperations.at(rawGraphDB);
                if (this.vertexIndexKeys.size() > 0)
                    populateKeyIndices(rawGraphDB, rawGraphDB.index().getNodeAutoIndexer(), graphOperations.getAllNodes(), Vertex.class);
                if (this.edgeIndexKeys.size() > 0)
                    populateKeyIndices(rawGraphDB, rawGraphDB.index().getRelationshipAutoIndexer(), graphOperations.getAllRelationships(), Edge.class);
                tx.success();
            } finally {
                tx.close();
            }
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage(), e);
        } finally {
            if (rawGraphDB != null) rawGraphDB.shutdown();

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        if (!rawAutoIndexer.isEnabled())
            return;




        final Set<String> properties = rawAutoIndexer.getAutoIndexedProperties();
        Transaction tx = rawGraphDB.beginTx();


        final PropertyContainer kernel = ((GraphDatabaseAPI) rawGraphDB).getDependencyResolver().resolveDependency(NodeManager.class).getGraphProperties();
        kernel.setProperty(elementClass.getSimpleName() + INDEXED_KEYS_POSTFIX, properties.toArray(new String[properties.size()]));


        int count = 0;
        for (final PropertyContainer pc : rawElements) {
            for (final String property : properties) {
                if (!pc.hasProperty(property)) continue;
                pc.setProperty(property, pc.getProperty(property));
                count++;
                if (count >= 10000) {
                    count = 0;
                    tx.success();
                    tx.finish();
                    tx = rawGraphDB.beginTx();
                }
            }
        }
        tx.success();
        tx.finish();
    }

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                builder.setConfig(GraphDatabaseSettings.node_keys_indexable, vertexIndexKeys.toString().replace("[", "").replace("]", "")).setConfig(GraphDatabaseSettings.node_auto_indexing, GraphDatabaseSetting.TRUE);
            if (this.edgeIndexKeys.size() > 0)
                builder.setConfig(GraphDatabaseSettings.relationship_keys_indexable, edgeIndexKeys.toString().replace("[", "").replace("]", "")).setConfig(GraphDatabaseSettings.relationship_auto_indexing, GraphDatabaseSetting.TRUE);


            rawGraphDB = builder.newGraphDatabase();
            Transaction tx = rawGraphDB.beginTx();


            try {
                rawGraphDB.getReferenceNode().delete();
                tx.success();
            } catch (Exception e) {
                tx.failure();
            } finally {
                tx.finish();
            }


            GlobalGraphOperations graphOperations = GlobalGraphOperations.at(rawGraphDB);
            if (this.vertexIndexKeys.size() > 0)
                populateKeyIndices(rawGraphDB, rawGraphDB.index().getNodeAutoIndexer(), graphOperations.getAllNodes(), Vertex.class);

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        if (!rawAutoIndexer.isEnabled())
            return;




        final Set<String> properties = rawAutoIndexer.getAutoIndexedProperties();
        Transaction tx = rawGraphDB.beginTx();


        final PropertyContainer kernel = ((GraphDatabaseAPI) rawGraphDB).getNodeManager().getGraphProperties();
        kernel.setProperty(elementClass.getSimpleName() + INDEXED_KEYS_POSTFIX, properties.toArray(new String[properties.size()]));


        int count = 0;
        for (final PropertyContainer pc : rawElements) {
            for (final String property : properties) {
                if (!pc.hasProperty(property)) continue;
                pc.setProperty(property, pc.getProperty(property));
                count++;
                if (count >= 10000) {
                    count = 0;
                    tx.success();
                    tx.finish();
                    tx = rawGraphDB.beginTx();
                }
            }
        }
        tx.success();
        tx.finish();
    }

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    public void testDatabase()
    {
        GraphDatabaseService database = module.findService( EmbeddedDatabaseService.class ).get().database();


        {
            Transaction tx = database.beginTx();


            try
            {
                Node rickard = database.createNode();
                rickard.setProperty( "name", "Rickard" );


                Node niclas = database.createNode();
                niclas.setProperty( "name", "Niclas" );


                rickard.createRelationshipTo( niclas, TestRelationships.KNOWS );


                tx.success();
            }
            finally
            {
                tx.finish();
            }
        }
    }

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        List<List<Relationship>> roadPartsToMerge = wayMerger.merge(wayId, startNode);


        dumpPartsToLog(wayId, roadPartsToMerge);




        Transaction tx = graphDb.beginTx();


        optimize(wayId, roadPartsToMerge);


        tx.success();
        tx.finish();


    }

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    }




    public void importXML(String xml) {


        Transaction tx = graphDb.beginTx();


        try {


            XMLReader xmlReader = XMLReaderFactory.createXMLReader();
            xmlReader.setContentHandler(new MainOSMHandler(xmlReader, graphDb));
            xmlReader.parse(xml);


            // Hallelujah
            tx.success();


        } catch (SAXException e) {
            System.err.println(e);
            tx.failure();
        } catch (IOException e) {
            System.err.println(e);
            tx.failure();
        } finally {
            tx.finish();
        }
    }

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        hits.close();
        return node;
   }
   
   private void makeRelationship(Node x, Node y, RelationshipType rt){
       Transaction tx = graphDb.beginTx();
       try{
           x.createRelationshipTo(y, rt);
           tx.success();     
       } catch (Exception ex){
           System.out.println(ex.getMessage());
       } finally {
           tx.finish();
       }  
   }

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    private Node createUpdateIndexNode(String id, Map<String, Object> properties){       
        IndexHits<Node> hits = idIndex.get(ID_KEY, id);
        Node node = hits.getSingle();
        hits.close();           
        Transaction tx = graphDb.beginTx();
        try {
            if(node==null){
                node = graphDb.createNode();               
                node.setProperty(ID_KEY, id);           
                idIndex.add(node, ID_KEY, id); 
            }           
            for(Entry<String, Object> entry: properties.entrySet()){
                String key = entry.getKey();
                Object value = entry.getValue();
                if(value!=JSONObject.NULL && key!=JSONObject.NULL) {
                    node.setProperty(key, value);
                }                
            }
            tx.success();       
        } catch (Exception ex){
            System.out.println("createUpdateIndexNode:" + ex.getMessage());            
        } finally {
            tx.finish();
        }
        return node;
    }

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        return node;
    }
    
     private Node createNotIndexNode(){                   
        Node node = null;
        Transaction tx = graphDb.beginTx();
        try {            
            node = graphDb.createNode();                                            
            tx.success();       
        } catch (Exception ex){
            System.out.println("createNotIndexNode:" + ex.getMessage());            
        } finally {
            tx.finish();
        }
        return node;
    }

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